Battery health

Not likely. Sometimes the battery health update is delayed and it updates in delayed chunks. 94% after 8 months is typical if used regularly on battery power.

nayab50 wrote:

Byt my sister’s phone’s battery health is still 100% although it’s been a year to her phone so should i worry about mine or is it normal?

It's not really something that compares well. I had an iPhone that was on 99% battery health **reading** for nearly a year, then dropped to 96% then 92% within a few months. The reading isn't a real time value. There are those whose capacity has likely dropped but don't update for a while.

Apple has access to battery health that's more "real time". When I had my battery replaced, they ran a diagnostic, and the battery health reading there was a good 3% less than what iOS Battery Health was stating.